fix(OpenIDConnect): Stop storing tokens in sessionStorage. Prefix OIDC routes automatically. Add logout button (#698)

public/config/google.js

@@ -13,7 +13,7 @@ window.config = {
       // Authorization Server URL
       authority: 'https://accounts.google.com',
       client_id: 'YOURCLIENTID.apps.googleusercontent.com',
-      redirect_uri: `${window.location}callback`, // `OHIFStandaloneViewer.js`
+      redirect_uri: '/callback', // `OHIFStandaloneViewer.js`
       response_type: 'id_token token',
       scope: 'email profile openid https://www.googleapis.com/auth/cloudplatformprojects.readonly https://www.googleapis.com/auth/cloud-healthcare', // email profile openid
       // ~ OPTIONAL